Steam chest and balance slide valve therefor



0a. 9, 1923., Mmm

H. IP. IROBIINSON STEAM CHEST AND BALANCE SLIDE VALVE THEREFOR Filed June 22, 1920 amvamtoz HERMAN P. ROBINSON], OF BRISTOL, TENNESSEE.

STEAM CHEST AND BALANCE SLIDE VALVE Application filed June 22, 1820. Serial 1 T0."390,803.

To all whom it may concern:

lie it known that l, HERMAN l RoinNsoN, a citizen oi the llnited States, residing lii'istoh in the county of Sullivan State of lennessce. have invented a new and useful Steam Chest and Balance Slide Valve 'l. heretor; and it do hereby declare the tollowing to be a full, elenr and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the art of? steam engincoring and more particularly to an improved steain valve chest and balance slide valve therefor.

lleretoiore steain chests have been constructed with their cover or top plates removable, which it has been found renters it very inconvenient to attain ready access to theinterior of the steam chest, and the slide valve therein, and also making it very dilllcnlt to remove the slide valve. and its red, tor inspection and repairs. Furthermore this form of construction prevents a mechanic from readily readjusting the valve in the chest. with relation to its red and the gearing o l, the rod, when replacing the valve utter inspection and making other repairs. Furthermore, in this form of construction it has been found inconvenient to rearrange the spring tensioned steam packing strips or member particularly when replacing the cover or top plate, owing to the packing strips or members tending to become displaced before the cover or top plate is finally secured in position.

cmsequently the present invention aims as its foremost object to overcome thesedisadvantages or diilicnlties, by providing an improved steam chest tor lialance slide valves, in which either head of the chest is readily removable or detachable, therehy permitting ready accessibility to the valve A further object er the invention is to provide a steam valve chest, having one or both ot'the heads easily removable from the chest, and should it he the head having the stuffing box. it may he slid hack on the valve rod, and the rod subsequently detached from the valve gear after which the yalve and the rod may be easily removed, so it can be easily inspected and also Siilo ected to any necessary machine work or other repairs; v

A further ohyect of the invention is to provide a device oi? this kind, in which the slide valve is readily removable as aforesaid thereby permitting ready access to the steai'n chest, whereby it inay be inspected, and repairs easily made. l

A further object of the invention is to provide a steam valve chest, in which either one or both oi the heads are removable, so

; that when replacing the valve it may he so coniplislwd with ease, without any inter- :l'ercnce troin the spring tensioiied steam packing ring or member, since they may be e sly held in place while sliding the valve into the chest.- In other words in replacing the valve after the repairs have been made, the packing ring; or members inay he readily adjusted into place.

A further object of the invention is to. provide a device of this kind, so that when replacing; the valve, its rod may be easily and quickly reconnected to the valve gear.

A further object of the invention is the provision of a steam valve chest, in which either one. or both of its heads are removable; one head carrying a stiifling box for the valve rod, the neck ring of which acts as a hearing, the other head carrying a relief valve. also a hearing for the extension valverod. This valve may he used either with or without this extension valve rod or front hearing.

In practical. fields the details of construe tion may necessitate alterations falling within the scope of what is claimed.

The invention comprises tiirther features and combination of partsas hereinafter set forth, shown in the drawings and claims.

in the drawintgsj-- Figure l is a view in perspective of an improved steam chest for balance slide valves constructed in accordance with the invention, showing the same mounted noon the steam cylinder.

l i 'ure 2 is a longitudinalsectional view on line 2 -2 of Figure 1; showing" the piston and the valve of the ste'aiii cylinder steain chest respectively in elevation. Fi ure 3 is a lan view (if the steam showing the same inonnted on the steam cyl' indei". I v

Figure iis a cross sectional vieiv on line 4 4 of Figure 3.

Figure 5 is a detail perspective view est one of the heads ottlie chest. .l igiire 6 is a detail view hi the balance slide valve. V I

Referring more specially to the drawings, 1 designates a conventional form of steam ice is provided with longitudinally extending' side flanges 8. The side flanges 8 extend laterally, and are fastened. or secured to en largement 5 by stud bolts 9 which pass through spacer ll. lVherethe edges of the hood casing T are secured, they are seated on copper joints 12. The top of the hood casing is provided with a longitudinally extending portion 13, in which is tor-med an oil duct 14, having its-end l :auclws l5 merging to and in communicationwith the inte rior 16 of the steam chest, and by the connection 17 any suitable or tional oil cup, not shown, n'iay be cennec ted.

in order to supply oil to said duct. Secured by the bolts 18 (which are threaded into the end edges of the hood casing) the steam chest head or end plates 19 and Q0 "e se cured to the hood casing. T he end plate or head "-19 at its lower part adjacent the side edges'is provided with laterally extending ears or lugs 21, bolts 2:2 extend through lugs 21 and spacer 11 and into the enlargement 5, thereby assisting and holding said head or plate 19 in place. Vifihere the ears or lugs 21 are secured, they engage the recess 23.

Projecting laterally from the head 19 is a flange 24 having openings 25. Also formed. upon the outer face ot the head 19 is one section or part 26 ot a stufling box. which is preferably of the shape shown. and passing through the opening 25 of the flange 24 are suitable stud bolts 27. which pass through spacer 11 and are threaded into enlargement 5, thereby holding the head 19 secure. By virtue'of the section or portion 26 of the stufiing box being rectangular and the stud bolts engaging on either side thereof, the head 19 is rendered more secure. The head 20 of'the steam chest has its lower portion provided with a lateral flange 28, which also engages a recess 29 of the spacer 11 of the enlargement 5, there'being bolts 30 passlng downwardly through the flangeQS, so as to secure the head 20 in position. It is to be noted that the hood casing and the two heads practically fit down over an auxiliary raised portion 31 of the s aacer 11, which also insures security of the steam chest. Formed. through the enlargement 5 and communicating the interior 16 of the steam chest withthe interior of the cylinder are the usual steam ducts 32 and Also formed in the 38, and passing through this acking box or gland the usual form of valve rod 39 reciprocates. Mounted upon the valve rod and, secured thereto in any suitable manner as shown at a0 is a balance slide valve 41, substantially similar to the one illustrated, set forth, and claimed in a former patent to H. P. Robinson, Patent No. 1,l4l0,188, on which the present invention is a vastim n'oven'ient, l'lowever, this balance slide valve comprises the semi-circular end heads 42 and the connecting bars orpa-rts 4L3, which integrally connect the lower side edges of said valve head, 4-1 and The edges of the heads 42 which wipe adjacent the inner circumference of the hood casing are channelled as shown. at ie-ct, to receive the usual spring tensioned steam packing rings or members 45, which are similar to the packing rings in the aforesaid patent. he outer faces of the connecting bars or members 43 are also channelled. to receive spring tensioned steam packing members +116, which members and those aiore-- said are designed to prevent the escape of steam from the spaces adjacent the end faces of the valve heads, to the steam exhaust cavity 47, which is between said valve heads. By virtue of the stutiing box. a bear ing for the valve rod is assured. to prevent excessive lifting of the valve from its seat face 48 off the sed part 31. l urtherinore, by means of the first mentioned steam packing members the lower face of the slide balance valve is held in close contact with its seat. .Preterably one end'ot the valve rod 39 is extended as shown at 4&9. and this extension is mounted in a bearing 50 of the tubular portion 51. which connects the usual steam'relief valve 52 to the head 20 of the steam chest. Th s tubular portion 51 is threaded into the head 20, and may be removed when desired, for repairing the relief valve. The extension 49 of the valve rod may be dispensed with if so desired. In the operation, steam passes through the port or passage 84 into the steam chest through the ports 35 and between the heads of the balance slide valve and the heads of the steam chest. As shown in Figure 2, the piston 2 is moving in the direction of the arrow a, and consequently the slide valve has uncovered the duct33, allowing steam to act 'TII in llti with the exhaust cavity 47 ot the slide valve,

the duct 32 is being thrown into communication with the steam space between the valve head 41 and the steam chest head 19, whereby the steam may act upon the face 0 of said piston 2, consequently move the piston in the reverse direction to the arrow 62%. By virtue of the extension 49 operating in its bearing 50, together with the neck ring bearing of the stuihng box, the valve rod 39 is caused to move in a straight line which greatly reduces the tendency to cock the valve or lift it from its seat.

The invention having been set forth what is claimed as new and useful is 2-- 1. In a steam chest for balance slide valves, a base having a raised rectangular shaped valve seat, a hood casing semicircular in cross section arching said seat and engaging the opposite sides of the raised rec tangular shaped valve seat, longitudinally disposed flanges carried by the hood casing and spaced from the side edges thereof, bolt passing through said flanges and extending into the base, semi-circular heads for said hood casing, said heads engaging the ends of the raisedportion forming the valve seat, bolts passing through said heads and into the ends of the hood casing, one of said heads being provided with a stuffing box for the reception of the valve'rod, a transversely disposed flange carried by said last named head and disposed above the stuffing box, bolts passing through said flange and into the base and located adjacent the sides of the stuffing box, lugs carried by said head adjacent its lower outer corners and engaging the valve seat base, and bolts passing A through said lugs and into the base.

2. in a steam chest for balance valves, a. base having a raised valve seat, a hood casing semi-circular in cross section arching said valve seat and engaging the sides of the raised portion forming the valve seat, a slide valve disposed within the hood casing, removable heads secured to the ends of the hood casing and engaging the end walls of the raised portion forming the valved seat, flanges carried by the hood and spaced from the lower edges thereof, bolts passing through said flanges and into the base, one of said heads being providing with a stuffing box for the reception of the valve stem, a flange carried by said last named head and disposed above the stutling box, bolts pass ing through said flange and into the base adjacent the stuffing box, lugs carried by the outer corners of said head and engaging the base, and bolts passing through said lugs into the base.

3. The combination with a slide valve dis posed on a raised valve seat, said slide valve being carried by a horizontally disposed valve rod, of a removable steam chest therefor, said removable steam chest comprising a semi-circular member arching the slide valve andsecured to opposite sides of the valve seat, removable semi-circular heads for said steam chest and slidably mounted on the valve stem, said heads being detachably connected with the ends of the semi-circular member and to the valve seat.

In testimony whereof I have signed my name to this specification in the presence of two subscribin witnesses.

HERMAN r. ROBINSON.

Witnesses:

H. A. Jones, E. Conn. 

